21895
domain: N
Appears in sequences
- a(n) = (8*n+1)*(8*n+7).at n=18A001533
- a(n) = (6*n+1)*(6*n+7).at n=24A085026
- Perimeter of integer triangle (A001611(n), A001611(n+1), A001611(n+2)).at n=19A097280
- Number of (w,x,y,z) with all terms in {0,...,n} and w=max{w,x,y,z}-2*min{w,x,y,z}.at n=23A212745
- Irregular triangle read by rows: T(n,k) gives the number of ballot sequences of length n having k descents, n>=0, 0<=k<=A083920(n-1).at n=57A238122
- Number of ballot sequences of length n having exactly six descents.at n=3A241799
- Number of ballot sequences of length 2n+1 having exactly n descents.at n=6A241805
- a(n) = the n-bit number in which the i-th bit is 1 if and only if prime(i) divides A060795(n).at n=14A277428
- a(n) = (n + 2)*(n^2 + n - 1).at n=27A318765